BIRDSTRIKE

Investigation of Bird Strike criteria for Natural Laminar Flow wings

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 Obiettivo del progetto (Objective)

'The BirdStrike project aims to establish a validated bird strike analysis capability, which enables the SFWA partners to simulate bird impact on a CFRP leading edge for a NLF wing. This will be achieved by setting up a combined program of test and analysis to determine the extent of damage and criteria to be applied to analyses of leading edge panels for NLF wings. The main scientific and technical work comprises six main research objectives in agreement to the present Call for Proposals (CfP) topic: 1) Analysis of bird strikes on flat and representative curved panels at various angles of impact, using an existing bird impact model that will be provided by the SFWA Partners. 2) Design and analysis of a supporting frame for bird-strike impact tests on flat and representative curved panels. 3) Manufacturing of an agreed number of flat and representative curved panels that include supporting stringers, sparcaps or other structural features. 4) Completion of impact tests at various angles. 5) Validation of analyses and numerical models. 6) Delivery of a tool that can predict the extent of damage in a representative Composite LE geometry.'

Introduzione (Teaser)

Impact of bird strikes on aircraft is an important component of modelling and simulation tools. A promising future wing concept requires novel consideration to get off the ground and scientists are delivering new tools to make it happen.

Descrizione progetto (Article)

The EU has launched its most ambitious research programme ever, Clean Sky, to drastically reduce emissions of both pollutants and noise associated with air transport. The natural laminar flow wing concept is one of the most important under development to reduce drag, fuel consumption and related emissions.

At a high level of maturity now, the geometry of the wing concept cannot be accommodated using existing numerical models and bird strike simulation. With EU support of the project 'Investigation of bird strike criteria for natural laminar flow wings' (BIRDSTRIKE), scientists are closing the gap. They are developing the necessary modelling tool for this and future concepts while conducting an experimental campaign to validate it.

During the first reporting period, the team selected the materials and designs for the test components representative of the leading-edge panels of natural laminar flow wings. Flat un-stiffened and stiffened panels will be manufactured using Hexcel's HexPly M21E epoxy prepreg made with HexTow IMA intermediate carbon fibre.

An elastic supporting system has been chosen to allow deformation of the carbon fibre-reinforced polymer plate during impact tests. The model birds are ready and preliminary bird strike tests and fast-impact measurements have been conducted with a high-speed digital image correlation camera.

Simulation work is progressing well with approaches adopted for the bird model, panel simulation, damage simulation and delamination modelling. In parallel, the team has developed simplified models of delamination that maintain required predictive ability with significantly lower computational loads.

BIRDSTRIKE is on its way to producing validated models of the effects of bird strike impact on the innovative natural laminar flow wing design. The simulation tools will close current gaps in the modelling of this new geometry, supporting its commercialisation with major benefits in fuel consumption and emissions.